Screen



Dec. 15 1925- A. L. ADREANSON ET AL SCREEN Original Fil-ed June 6; 1921 2 Sheets-Sheet 2 .5. Ln/idwiansov u ATTORN EY WITNESS:

Patented Dec. 15, 1925.-

UNITED STATES P TENT OFFICE.

ALFRED L. ADRTANSON AND AXEL L. BENGTSON, OF RACINE, WISCONSIN, ASSIGNOBS OF ONE-THIRD T GEQRGE W. LENZIE, OF LEMONT, ILLINOIS.

SCREEN.

Application filed June 6, 1921, Serial No. 475,366. Renewed May 18, 1925.

To all whom it may concern:

Be it known that we, ALFRED L. ADRIAN- SUN and AXEL L. Bnne'rson, citizens of the United States, residing at Racine, in the county of Racine and State of Wisconsin,

have invented new and useful Improvementsof which the following is a nature.

The principal object of the invention is to provide a resiliently supported screen frame with means for vibrating the same to agitate the material thereupon.

Another object of the invention is to provlde a rotary shaft with one or more weights thereon, eccentrically arranged, for vibrating the screen when the shaft is rotated.

A still further object of the invention is to provide means for adjusting the tension of the screen whenever necessary.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illus-' trated in the accompanying drawings'and specifically pointed out. in the appended claims.

In describing our invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a plan View of the device with parts of the screen cloth broken away.

Figure 2 is a side elevation.

Figure 3 is an end view.

Figure 4 is a section on line 4-4 of Figure 1.

Figures 5 and 6 are detail views.

As shown in these views the apparatus consists of a base frame 1, the screen supporting frame 2, the semi-elliptical springs 3 for supporting the frame 2 on frame 1 and the vibratory shaft 4 for vibrating the frame 2 upon the base frame or base 1, preferably at the ends. The springs 3 are located at the ends of the frame and are pivotally secured to the base frame through the medium of the links 3 connecting the respectivefinds of the spring to the supporting ears 3", which are secured to the base frame 1, thereby subjecting the springs to a lateral swinging or tilting movement. The

frame 2 isof channel shape and is provided with an upper screen 5 and a lower screen 6. The tension of each screen can be adjusted by the bolts 7 which pass'through the sides of the screen frame, the bolts being connected to angle irons 7, between which and irons or bars 8 the side margins of the screen are secured or anchored with gap or' clearance between the same and the sides of the screen frame to permit the necessary adjustment. The screen frame is braced by the bars 8 which extend across the topof the same. Bearings or hearing castings 9 are bolted or placed on the upper part of the screen frame at the center thereof and one at each side, these castings containing the ball bearings 10. Theishaft 4 is journaled' in said bearings and is adapted to be rotated in any desired manner. This shaft has con nected therewith the weights 12 which are eccentrically mounted on the shaft so as to set up the vibration when the shaft is rotating. These weights rotate free of the screen.

The screen is set at an angle and the material to be screenedis placed at the high end of the top screen. Thistop screen is of wider mesh than the lower screen and when the shaft is rotated the vibrations will cause the material to travel along the screen, the large particles dropping off the lower end thereof while the smaller particles dropping through the screen will be caught by the lower screen. The particles that are too large to pass through the second screen will travel along the same and drop off at the lower end thereof while the small particles will pass through the screen. Thus the material will be graded into three different sizes. The screen cloths being tight adds to the vibratory motion, a whipping motion so that thematerial literally dances over the screen. As the material does not have the sliding motion that is common to shaker screens it does not wear the cloth as quickly as in the shaker screen. This apparatus will take care of larger quantities of material and in the same time than screens now in use and due to the rapid vibration and the whipping motion it can be set at a steeper angle and still screen the material perfectly.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

We desire it to be understood that we may make changes in the construction and in the combination and arrangement of "the several parts, provided that such changes fall within the scope of the appended claims.

What we claim is 1. In a device for the purpose set forth, the combination of \a screen carrying frame and revoluble weighted means thereon for imparting a longitudinal vibratory movement to the screens, a support secured to the ends of the frame, comprising arched resilient members centrallyattached to the frame, a base to which the ends of said members are secured, and whereby the frame will be afforded a lateral tilting movement in both directions when the weighted means is revolved. v

2. A screening apparatus including a base, a screen frame, semi-elliptical springs supporting the frame upon the base andhaving shackle connections at their outer ends with the base, a screen mounted across the frame,

bearings on the frame, a shaft rotatablyjournaled in the bearings, and weights eccentrically fixed on the shaft.

3. A screening apparatus, comprising supporting means, a screen frame, semi-elliptical springs mounted transversely between the ends of the frame and the sup orting means and extending substantial y the width of the screen, the connections of the springs to the. sup orting means and frame being locatedme ally and at the ends of the springs, screens mounted between the 4 the ends to the base, means for vibrating the screen frame in a vertically elongated elliptical path, a screen in the frameand means for adjusting the tension of the same.

5. A screening apparatus, comprising a base, a screen frame, semi-elliptical leaf springs mounted transversely between the endsof the frameand the base, said springs being secured interme'diately to the frame and having shackled connections at their ends to the base, a screen mountezl between the sides of the frame, bearings upon the y top of the frame, a shaft rotatably journaled in the bearings, and weights eccentrically fixed on the shaft to impart a vibratory movement to the frame and screen in a path substantially ovate with the up-anddown motion greater than the endwise motionuniformly throughout the area of the screen.

In testimony whereof we afiix our signatures.

i AXEL L. BENGTSON.

. ALFRED L. ADRIANSON. 

